Roll-holder for wrapping machines



Nov. 2 1926. 1,605,650

- J. DERRY ROLL HOLDER FOR WRAPPING MACHINES Filed Feb. 23. 1924 2 Sheets-Sheet 1 v INVEN+DVZ $1 i 7 Aim d f p gmy I Nov. 2 1926. "1,605,650

- J. DERRY I ROLL HOLDER FOR WRAPPING MACHINES Filed Feb. 23. 1924 2 Sheets-Sheet 2 INVENlDY:

M g hM AMw P Patented Nov. 2, 1926.

UNITED STATES V tsetse PATENT OFFICE.

JASlER DERBY, OF MEDFORD, MASSACHUSETTS, ASSIGNOR TO ANDREW TER-KELSEN,

, OF BOSTON, MASSACHUSETTS.

ROLL-HOLDER FOR WRAPPING MACHINES.

Application filed February 23, 1924. Serial No. 694,582.

This invention relates to wrapping machines, and particularly to the means for supplying the paper or other wrapping material,'and has for its general object to provide a construction wherein the wrapping material will be fed to the work under a constant tension so as to be applied to and wrapped about the work with an even degree of tightness.

The more particular obj ects of the invention, together with means whereby the same may be carried into effect, will best be understood from the following description of one form and application thereof illustrated in the accompanying drawings. It will be understood, however. that the particular construction and application described and shown have been chosen for illustrative purposes merely, and that the invention. as defined by the claims hereunto appended, may be otherwise practised without departure from the spirit and scope thereof.

In said drawings:

Fig. 1 is a front elevation of a Wrapping machine having the invention applied thereunto.

Fig. 2 is an enlarged front elevation of a portion of the shuttle and associated parts.

Fig. 3 is a plan view of the parts shown in Fig. 2.

Fig. 4 is a further enlarged section taken substantially on the line 4-4, Fig. 2.

Fig. 5 is a still further enlarged section on the line 5-5, Fig. 4.

Fig. 6 is a detail view of the roll gripping eccentric.

The invention is herein illustrated as applied to a machineof well-known type for wrapping annular objects, such, for example, as automobile tires, coils of wire, etc. The frame of said machine comprises a base 15 and a yoke 16 which is pivotally mounted on a shaft 17 journalled, in an upright 18 rising from thebase 15,,said yoke being adjustable about the axis of said shaft, and being secured in adjusted position by a clamp 13 carried by a, second upright 12. The yoke 16 is provided with guide rollers 19 for. an annular shuttle 20 on which is rotatably mounted aroll 14 of paper or other wrapping material. The shuttle 2O isrotated by a friction disk 21 secured to the shaft .17 and driven (through connectionsnot shown in detail) from an electric motor 23. The tire or other work W to be wrapped is carried by work supporting rollers 24 (only one of which is shown in Fig. 1) which are driven, through connections generally indicated at 25, from the motor 23, the arrangement being such that the work W is turned relatively slowly with respect to the speed of rotation of the shuttle 20, so that a strip S of paper or other wrapping material is drawn from the roll 14 and wrapped spirally about the work.

In accordance with the present. invention, means are provided for applying a substantially constant tension to the strip S as it is led from the roll 14 to the work W in order tocause said strip to be wrapped tightly and evenly about. the work. To this end, the roll 14 is secured against rotation upona rotatable spindle to which a brake is applied in order to resist its free rotation, means being provided automatically to proportion the force with which said brake is applied to the diameter of the roll, it being obvious that in order to keep constant the tension upon the strip, which is drawn from the periphery of the roll, a greater braking force applied upon the spindle is required when the roll is relatively large than when it is relatively small.

For convenienceof construction, the roll supporting spindle preferably comprises a stud (see Figs. 4 and 5) projecting from the front face of the shuttle, a sleeve 31 rotatably mounted on said spindle and formed with a reduced eccentric extension 33, and a sleeve 32 secured to the outer end of said extension, as by a set screw 53. The sleeves 31 and 32 collectively constitute a substantially unitary spindle member rotatably mounted on the stud 30 and comprising coaxial portions 31 and 32 of equal diameter and an intermediate eccentric portions 33 of reduced diameter. Rotatably mounted on the reduced eccentric portion 33 of the spindle is an eccentric 34 of a diameter substantially equal to or slightly greater than the diameter of the sleeve portions 31 and 32 and having a knurled or roughened exterior surface, as shown in Fig. 6. The roll 14 is provided with a central, hollow, paper or similar core which is of an interior diameter substantially equal to or slightly greater than the major exterior diameter of the built-up spindle. When the roll is to be placed upon the spindle. the e centric 34 is turned upon the eccentric 33 in a clockwise direction from the position shown in Fig. 5 into a position substantially concentrio with the sleeves 31 and 32. For the convenience of the operator, the latter position is auton'iatically determined by the engagement of a pin 54 with the end a of a groove 55 formed in the adjacent end of the eccentric 34. IV hen the roll has been placed on the spindle, incipient rotation thereof, in a counter-clockwise direction, with respect to the spindle, induced by withdrawal of the strip S, will cause the eccentric 34, by the frictional engagement of its roughened surface with the interior of the core 35, to be turned with said roll and thereby move outwardly to grip said core and bind the same firmly upon the spindle so as to be held against rotation with respect thereto. It will be seen that the greater the force tending to turn the roll upon the spindle, the greater will be the wedging action of the eccentric 34 tending to resist such turning.

The sleeve 31 of the spindle is formed with a brake drum portion 36 which is embraced by a pair of brake shoes 37 and 38 pivotally connected to one another and to the shuttle 20 by a bolt 39. The free end 4 of the brake shoe 38 is formed with an opening to receive a longitudinally movable rod 41 having a head 42 between which and the end 4 of said brake shoe is interposed a spring 43. The rod 41 is connected by a link 5 with an arm or lever 45 pivoted at 46 to the free end 47 of the brake shoe 37. It will be seen that the spring 43 tends to contract the brake shoes 37 and 38 about the brake drum 36 with a force depending upon the compression of said spring which in turn may be controlled by movement of the arm 45 about its pivot 46. Said arm 45 is formed adjacent its free end with a slot 48 to receive a pin 49 projecting laterally from a lever 50 pivoted at 51 to the shuttle 20, one arm of said lever engaging the per riphery of the roll 14, and the other being weighted, as shown at 52, whereby said first-named arm is held in engagement with said roll by centrifugal action due to the rotation of the shuttle.

It will thus be seen that the lever 50 and arm 45 serve to control the force with which the brake is applied to the spindle, thereby proportioning the same to the diameter of the roll and the consequent moment of the force exerted upon the latter by the tension of the strip S. Thus, when said roll is of relatively large diameter, the lever 50 occupies a relatively elevated position and holds the arm 45 in a position to increase the compression of the spring 43, thereby applying the brake with sufficient force to balance the moment of the tension of the strip S as transmitted to the spindle, to which the braking force is applied. As the diameter of the roll diminishes, the lever 50 moves inwardly, permitting the arm 45 to relax the spring 43 somewhat, thereby reducing the force with which the brake is applied in proportion to the reduction of the size of the roll, and permitting the diminished braking force so applied to continue to balance a constant tension of the strip S applied to the roll at a decreased distance from the center.

Having thus described my invention, I claim:

1. In a wrapping machine, a rotary support having rotatable means for carrying a roll of wrapping material, means for resisting rotation of said roll, and means held against the periphery of said roll by centrifugal force for automatically proportioning in accordance with the diameter of the roll the resistance applied by said second named means.

2. In a wrapping machine, a rotary support having rotatable means for carrying a roll of wrapping material, means for resisting rotation of said roll, and means controlled by centrifugal force for automatically varying said resistance continuously during the unwrapping of the material from the roll.

3. In a wrapping machine, the combination of a rotatable shuttle, a rotatable support carried thereby for aroll of wrapping material, brake means for said support, an arm pivoted intermediate its ends for controlling said brake means, one end of said arm engaging the periphery of the roll and the other end at the opposite side of the pivot being heavier thereby holding the lighter end of the arm by centrifugal force against the roll.

4. In a wrapping machine, the combination of a rotary support, a rotatable member carried thereby for supporting a roll of wrapping material, means for resisting rotation of said member and including a pair of pivotally connected brake shoes embracing said member, a spring actuated device for normally contracting said brake shoes, and a member carried by said support and controlled by the diameter of said roll and acting during the rotation of said support to spread said brake shoes against the action of said device.

5. In a wrapping machine, in combination, means for rotatably supporting a roll of wrapping material, means for resisting the rotation of said roll. and means including a weighted lever resting against the periphery of said roll for determining the amount of the resistance so applied. 7

6. In a wrapping machine. in combina tion, a rotatable shuttle, means for rotatably supporting a roll. of wrapping material thereon. means for resisting the rotation of said roll, and means for determining the amount of the resistance so applied, said means including a member held against the periphery of said roll by centrifugal action due to the rotation of said shuttle.

7. In a Wrapping machine, in combination, a rotatable shuttle, means for rotatably supporting a roll of wrapping material thereon, means for resisting the rotation of said roll, and means for determining the amount of the resistance so applied, said means including a lever having a weighted end, pivoted intermediate its ends and resting at the opposite end against the periphery of said roll.

8. In a wrapping machine, in combination, a rotatable spindle for supporting a roll of Wrapping material, a brake for said spindle, a spring for applying said brake, an arm for controlling the tension of said spring, and a lever resting against the periphery of said roll and connected with said arm.

9. I11 a wrapping machine, in combination, a rotatable spindle for supporting a roll of Wrapping material, a brake for said spindle, a spring for applying said brake, a movable abutment for said spring, a member resting against the periphery of said roll, and operative connections between said member and abutment for moving the latter.

10. In a wrapping machine, in combination, a rotatable spindle for supporting a roll of Wrapping material, a brake for said spindle, a spring for applying said brake, a movable abutment for said spring, an arm for moving said abutment, and a lever resting against the periphery of said roll and connected with said arm.

11. In a wrapping machine, in combination, means for rotatably supporting a roll of wrapping material, means for resisting the rotation of said roll. an arm for controlling said resisting means, a pivoted lever resting against the periphery of said roll, and a pin projecting from said lever, said arm having a slot to receive said pin. 12. In a wrapping machine, in combination, a rotatable spindle for supporting a roll of wrapping material, said spindle having a brake drum portion, a pair of pivotally connected brake shoes embracing said brake drum portion, a spring for contracting said brake shoes about said brake drum portion, a rod for compressing said spring, a pivotal arm to which said rod is connected. a pivoted lev'er resting against the periphery of said roll, and a pin projecting from said lever, said arm having a slot to receive said pin.

In testimony whereof I aflix my signature.

JASPER DERBY. 

